Fuel injection



Oct. 23, 1945.

' Filed Dec. 7, 1942 2 j N 4 J. Q I? Q m INVENTOR line is relieved.

Patented Oct. 23., 1-945 UNITED STATES PATENT OFFICE e 2,3ilfl,690 eFUEL INJECTION I Roderick w. Stelzel, East Orange, N. 1., assignor toBendix Aviation Corporation, Bendix, N. L,-

a. corporation of Delaware Application December 7, 1942, Serial No.468,151

2 Claims. (Cl. 299-1016) My invention relates to a fuel injecting deviceand more particularly to a system embodyin means which intermittentlyintroduces fuel under pressure to an injecting device provided with animproved fuel jet control means.

In the conventional type fuel injecting devices it is difficult topositively control fuel flow to the discharge jet, particularly when thefuel in the system is subjected only to relatively low pressure. It isdifficult to accurately control the beginning and ending of fueldischarges with such sure fuel injectionsystem by providing a freefloating sleeve valve operable in response to fuel pressure forcontrolling flow of fuel to the discharge jet of the device.

A further object of my present invention is to provide a fuel injectingdevice of economical construction and positive action by constructingsame with an internal valve means consisting of a free floating sleevevalve operable in response Fig. 2 is a view along line 2-2.of Fig. 1:and

Fig. 3 is an exploded .perspective view of the sleeve valve and outletfixture.

Fig.4 is a cross-sectional view taken on the line 4-4 of Fig. 1.

These fuel injecting devices may, if desired, be suitably attacheddirectly to a fuel injector, or

may be suitably connected to a union 25 when same is remotely associatedwith a fuel injector. The union 25 preferably is suitably connected to asource of fuel supply that is intermittently subjected to pressure.

terminal fitting 25, whose bore 28 serves as the fuel conveying means.An outlet fixture is tightl fitted into the casing, and has a shoulder34 registering with a mating shoulder in the casing. There is a centralpassage 36 extending longitudinally of the fixture and communicatingwith a transverse passage 31 extending substantially normal to passage3!. Radial slots ll are machined in the outer end of fixture and theseslots communicate with the transverse to fuel pressure to openthe valveand operable in response to spring pressure to yieldin gly close thevalve and to thereby positively cut oil. the fuel injection when thefuel pressure in the supply Still further objects of the inventionrelate to various features of construction and assembly of the injectingdevice in conjunction with a fuel supply system having incorporatedtherewith a fuel injector having a fuel pump which is operable tointermittently supply fuel under pressure thereto.

For a more detail understanding of my invention, reference may be had tothe accompanying drawing illustrating in detail an embodiment of myinvention in conjunction with a fuel supply system of an internalcombustion engine, in which drawing like 'characters refer to like parts7 throughout the several views. and in which:

Fig. 1 is a longitudinal detail sectional view through a fuel injectingdevice illustrating the valve construction in detail and showing thevalve in the closed position;

passage 31 and serve as a passageway for conducting fuel to thedischarge jet 29 said slots 38 being preferably constructed to extendsubstantially tangentially with respect to the discharge jet 29. Thusthe fuel introduced to the discharge jet is induced to swirl and resultsin finely atomizing the fuel as it is discharged through the dischargejet 28. This arrangement is substantially the same as in Patent No.2,044,694, grantedto Henry Huss, or as in Patent No. 2,294,029, grantedto Carl F. High on Au ust 25, 1942, but the associated valve structurediffers from that of these patents, and will now be described.

The valve structure consists of a sleeve ll hav-- ing a sliding fit overthe end portion of the outlet fixture 35, and a-closed head llconstantly urged (by a spring 42) 'againstthe' annular end surface offitting 25, the innermost position of the fitting being determined bythe; engagement of mating tapered portions of the fitting and easing,as. shown at 46. A hole '48 is drilled longitudinally of 2, I a,ss7,oao

ameter bore ll of the sleeve receives the reduced end I! of the fixture3!, and a bleed hole 08 connects said bore II with axial passage 8!,

to facilitate free release of pressure from bore a, II, at all times.Vent 8! acts similarly to release iuelwhich enters the space occupied byspring 42.

. The parts SI and I! are held in place by inwardly turning the end 01'casing ll, after insertion of said parts 35 and 29. Hence there are onlytwov removable parts, namely, the sleeve 4. and the 10 spring 42.Because of this, there is less likelihood of anything being mislaid ordamaged durin overhaul. Moreover, the feature of the tapered seat llprovides automatic correct registry of within said casing and comprisingan outlet memher abutting a d discharge jet and havingalongitudinai'bore communicating with said let, a removable sleeve valvemember slidably mounted on: said outlet member and operable in onedirection to an open position in response to fuel pressure in saidconduit and in an Opposite direction to a closed position, said valvemember .iorined with a circular groove in its inner peripheral-face anda longitudinal bore eilecting' communication nicating with itslongitudinal bore and intermittently registrable with said groove whensaid valve member is operated between said positions, a springconstantly urging said valve member in said opposite direction, andmeans including mat-.

ing tapered surfaces on said casing and conduit for automaticallylocating said valve member and limiting its, travel in said oppositedirection.

2. A fuel injecting device comprising a casing provided with a fuelintake means and a fuel discharge let member and unitary valve means sulported within said casing and including an outlet fixture abutting saiddischarge jet member, and'a sleeve valve operable in one direction to anopen position in response to fuel pressure in said casing and in anopposite direction to a closed position, said valve and outlet fixturehaving axially oflset, longitudinal bores, one of which is aligned withthe discharge let member, said outlet fixture having a transverse. boreopening-into said one longitudinal bore and intermittently registrablewith the other of said longitudinal bores when said valve isoperatedbetween said positions, a spring constantly urging said sleeve valve insaid opposite direction, and means, including mating tapered surfaces onsaid casing and fuel intake means, for automatically locating saidsleeve valve and limitingits travel in said opposite direction. saidspring and sleeve valve being removable and between said groove and saidintake conduit, said 'said outlet fixture being permanently secured.

outlet member having a transverse bore commu- RODERICK W. STELZEL.

